// Scintilla source code edit control
/** @file XPM.cxx
 ** Define a class that holds data in the X Pixmap (XPM) format.
 **/
// Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#include <string.h>
#include <stdlib.h>

#include "Platform.h"

#include "XPM.h"

#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif

static const char *NextField(const char *s) {
    // In case there are leading spaces in the string
    while (*s && *s == ' ') {
        s++;
    }
    while (*s && *s != ' ') {
        s++;
    }
    while (*s && *s == ' ') {
        s++;
    }
    return s;
}

// Data lines in XPM can be terminated either with NUL or "
static size_t MeasureLength(const char *s) {
    size_t i = 0;
    while (s[i] && (s[i] != '\"'))
        i++;
    return i;
}

ColourAllocated XPM::ColourFromCode(int ch) const {
    return colourCodeTable[ch]->allocated;
#ifdef SLOW
    for (int i=0; i<nColours; i++) {
        if (codes[i] == ch) {
            return colours[i].allocated;
        }
    }
    return colours[0].allocated;
#endif
}

void XPM::FillRun(Surface *surface, int code, int startX, int y, int x) {
    if ((code != codeTransparent) && (startX != x)) {
        PRectangle rc(startX, y, x, y+1);
        surface->FillRectangle(rc, ColourFromCode(code));
    }
}

XPM::XPM(const char *textForm) :
    data(0), codes(0), colours(0), lines(0) {
    Init(textForm);
}

XPM::XPM(const char *const *linesForm) :
    data(0), codes(0), colours(0), lines(0) {
    Init(linesForm);
}

XPM::~XPM() {
    Clear();
}

void XPM::Init(const char *textForm) {
    Clear();
    // Test done is two parts to avoid possibility of overstepping the memory
    // if memcmp implemented strangely. Must be 4 bytes at least at destination.
    if ((0 == memcmp(textForm, "/* X", 4)) && (0 == memcmp(textForm, "/* XPM */", 9))) {
        // Build the lines form out of the text form
        const char **linesForm = LinesFormFromTextForm(textForm);
        if (linesForm != 0) {
            Init(linesForm);
            delete []linesForm;
        }
    } else {
        // It is really in line form
        Init(reinterpret_cast<const char * const *>(textForm));
    }
}

void XPM::Init(const char *const *linesForm) {
    Clear();
    height = 1;
    width = 1;
    nColours = 1;
    data = NULL;
    codeTransparent = ' ';
    codes = NULL;
    colours = NULL;
    lines = NULL;
    if (!linesForm)
        return;

    const char *line0 = linesForm[0];
    width = atoi(line0);
    line0 = NextField(line0);
    height = atoi(line0);
    line0 = NextField(line0);
    nColours = atoi(line0);
    line0 = NextField(line0);
    if (atoi(line0) != 1) {
        // Only one char per pixel is supported
        return;
    }
    codes = new char[nColours];
    colours = new ColourPair[nColours];

    int strings = 1+height+nColours;
    lines = new char *[strings];
    size_t allocation = 0;
    for (int i=0; i<strings; i++) {
        allocation += MeasureLength(linesForm[i]) + 1;
    }
    data = new char[allocation];
    char *nextBit = data;
    for (int j=0; j<strings; j++) {
        lines[j] = nextBit;
        size_t len = MeasureLength(linesForm[j]);
        memcpy(nextBit, linesForm[j], len);
        nextBit += len;
        *nextBit++ = '\0';
    }

    for (int code=0; code<256; code++) {
        colourCodeTable[code] = 0;
    }

    for (int c=0; c<nColours; c++) {
        const char *colourDef = linesForm[c+1];
        codes[c] = colourDef[0];
        colourDef += 4;
        if (*colourDef == '#') {
            colours[c].desired.Set(colourDef);
        } else {
            colours[c].desired = ColourDesired(0xff, 0xff, 0xff);
            codeTransparent = codes[c];
        }
        colourCodeTable[static_cast<unsigned char>(codes[c])] = &(colours[c]);
    }
}

void XPM::Clear() {
    delete []data;
    data = 0;
    delete []codes;
    codes = 0;
    delete []colours;
    colours = 0;
    delete []lines;
    lines = 0;
}

void XPM::RefreshColourPalette(Palette &pal, bool want) {
    if (!data || !codes || !colours || !lines) {
        return;
    }
    for (int i=0; i<nColours; i++) {
        pal.WantFind(colours[i], want);
    }
}

void XPM::CopyDesiredColours() {
    if (!data || !codes || !colours || !lines) {
        return;
    }
    for (int i=0; i<nColours; i++) {
        colours[i].Copy();
    }
}

void XPM::Draw(Surface *surface, PRectangle &rc) {
    if (!data || !codes || !colours || !lines) {
        return;
    }
    // Centre the pixmap
    int startY = rc.top + (rc.Height() - height) / 2;
    int startX = rc.left + (rc.Width() - width) / 2;
    for (int y=0; y<height; y++) {
        int prevCode = 0;
        int xStartRun = 0;
        for (int x=0; x<width; x++) {
            int code = lines[y+nColours+1][x];
            if (code != prevCode) {
                FillRun(surface, prevCode, startX + xStartRun, startY + y, startX + x);
                xStartRun = x;
                prevCode = code;
            }
        }
        FillRun(surface, prevCode, startX + xStartRun, startY + y, startX + width);
    }
}

const char **XPM::LinesFormFromTextForm(const char *textForm) {
    // Build the lines form out of the text form
    const char **linesForm = 0;
    int countQuotes = 0;
    int strings=1;
    int j=0;
    for (; countQuotes < (2*strings) && textForm[j] != '\0'; j++) {
        if (textForm[j] == '\"') {
            if (countQuotes == 0) {
                // First field: width, height, number of colors, chars per pixel
                const char *line0 = textForm + j + 1;
                // Skip width
                line0 = NextField(line0);
                // Add 1 line for each pixel of height
                strings += atoi(line0);
                line0 = NextField(line0);
                // Add 1 line for each colour
                strings += atoi(line0);
                linesForm = new const char *[strings];
                if (linesForm == 0) {
                    break;  // Memory error!
                }
            }
            if (countQuotes / 2 >= strings) {
                break;  // Bad height or number of colors!
            }
            if ((countQuotes & 1) == 0) {
                linesForm[countQuotes / 2] = textForm + j + 1;
            }
            countQuotes++;
        }
    }
    if (textForm[j] == '\0' || countQuotes / 2 > strings) {
        // Malformed XPM! Height + number of colors too high or too low
        delete []linesForm;
        linesForm = 0;
    }
    return linesForm;
}

// In future, may want to minimize search time by sorting and using a binary search.

XPMSet::XPMSet() : set(0), len(0), maximum(0), height(-1), width(-1) {
}

XPMSet::~XPMSet() {
    Clear();
}

void XPMSet::Clear() {
    for (int i = 0; i < len; i++) {
        delete set[i];
    }
    delete []set;
    set = 0;
    len = 0;
    maximum = 0;
    height = -1;
    width = -1;
}

void XPMSet::Add(int id, const char *textForm) {
    // Invalidate cached dimensions
    height = -1;
    width = -1;

    // Replace if this id already present
    for (int i = 0; i < len; i++) {
        if (set[i]->GetId() == id) {
            set[i]->Init(textForm);
            set[i]->CopyDesiredColours();
            return;
        }
    }

    // Not present, so add to end
    XPM *pxpm = new XPM(textForm);
    if (pxpm) {
        pxpm->SetId(id);
        pxpm->CopyDesiredColours();
        if (len == maximum) {
            maximum += 64;
            XPM **setNew = new XPM *[maximum];
            for (int i = 0; i < len; i++) {
                setNew[i] = set[i];
            }
            delete []set;
            set = setNew;
        }
        set[len] = pxpm;
        len++;
    }
}

XPM *XPMSet::Get(int id) {
    for (int i = 0; i < len; i++) {
        if (set[i]->GetId() == id) {
            return set[i];
        }
    }
    return 0;
}

int XPMSet::GetHeight() {
    if (height < 0) {
        for (int i = 0; i < len; i++) {
            if (height < set[i]->GetHeight()) {
                height = set[i]->GetHeight();
            }
        }
    }
    return (height > 0) ? height : 0;
}

int XPMSet::GetWidth() {
    if (width < 0) {
        for (int i = 0; i < len; i++) {
            if (width < set[i]->GetWidth()) {
                width = set[i]->GetWidth();
            }
        }
    }
    return (width > 0) ? width : 0;
}
